When i try to smush an image manually i get many Notices.. i don't like Notices.
Undefined variable: file in wp-smushit.php on line 248
Undefined property: stdClass::$dest_size in wp-smushit.php on line 180
Undefined property: stdClass::$dest in wp-smushit.php on line 183
Undefined property: stdClass::$dest in wp-smushit.php on line 183
etc..
S.